Forging machine



June 28,1927.

' H. B. HALVORSEN FORGING MACHINE Filed April 20, 1925 Hawker-Z13 Halvar-56m Patented June 28, 1927.

"i'nii'rsn STATES HALBERT B. nanvonsnn, or

MICHIGAN CITY, nnmna, nssrenon TO SULLIVAN MACHINERY COMPANY, ACORPORATION OF MASSACHUSETTS.

FORGING MACHINE.

Application filed April 20, 1925. Serial No. 24,420.

A relates to forging machines and more particularly to a machine forforging coal mining machine cutter bits.

In a forging machine of the type herein disclosed the bit portion'of thecutter bit is forgec roller die bet een which and the cutter bit or workpiece relative reciprocatory movement takes place. i I to forgo the hitsas rapidly as possible while the bit is hot, but due to certainconditions it is only possible to pass the roller over the bit duringthe forging stroke at a limited speed.

It is also desirable to have the actuating force for the die musteffectively applied when the die is in actual forging contact with thebit.

It is also desirable to have the forging roller die whicn is freelyrotatable present a new surface thereof during each forging stroke.While the roller may spin at the end of each stroke and thereby presenta new surface, yet byjmy improved means employed herein the spinningaction will be considerably augmented and thereby more positively insurepresentation of a new por tion of the surface. It is especiallydesirable to present this new surface for the reason that if the dierolls back and forth, each time having the same portion of its surfacengaging thebit, that portion of the surface might becomeexcessivelyworn but of more immediate importance is the fact that scale or otherforeign matter might adhere to the forging SUI'ftLCG and as a resultupon being successively rolled into contact with the bit would have atendency to press the his invention by a matter into the surfacethereof.

It is accordingly an object of the invention to provide improved meanswhereby the number of forging strokes for a given length of time will beincreased whil retaining a normal forging speed. A- more specific objectof the invention is to provide an improved arrangement of a crank andconnecting rod driving mechanism to effect a normal forging stroke and aquick re urn stroke of the forging die. Another object of the inventionis to provide improved means whereby the crank shaft for actuating thedie will exert its actuating force in a more direct line on the crosshead carrying the die and while the latter has forging contact with thebit. More specifically an object of the invention is to provide It isdesirable the cross head actuating means for the die comprising aconnecting rod and crank shaft, the center of which is displaced belowthe plane of movement of thewrist pin connecting the rod to theforgingdie cross head. The single construction permits all the abovefunctions to be performed.

In the accompanying drawings I have shown for purposes of illustrationone form which my invention may assume in practice. In these drawings, o

Fig. 1 is a side elevation of a forging machine partly broken away toshow details of construction.

Fig. 2 is a diagrammatic exaggerated view showing the crank andconnecting rod in the position for obtaining maximum forward movement ofthe cross head carrying the roller die.

Fig. 3 is a similar diagrammatic view showing the parts in position forobtaining maximum rearward movement of the cross head.

In vthis illustrative embodiment of the invention base frame 1 mountedupon legs 2' and 3 carries a reciprocable crosshead 4 guided in lateralways 5. The front end of supports a yieldably pivoted member ('3carrying in a clapper box 7 a freely rotatable forging die roller 8having a uniform peripheral groove 9. An upwardly extending slot in aframe 10 holds a bit blank 11 during forging which causes the bit faceto engage the face of a stationary die 12 which is similar in transverseconfiguration to the cross sectional area of the groove 8 and to thefinished bit end. My improved means for reciprocating the die 8comprises a crank shaft 13 having a crank pin let rotatably driven by abelt fly wheel 15 about a central axis 16 which is disposed below thehorizontal plane containing the axis of a' wrist pin 17 which connects arod 18 carried by the crank pin 14: to the crosshead 4. In Figs. 2 and3-the center 16 of the crank is diagrammatically shown considerablybelow the line of movement of the wrist pin 17, it being noted that whenthe crank is on the right hand side of its center and in line with theconnecting rod 18, the crosshead 1 will be at its maximum forwardposition. WVhen the crank is at the left hand side of its center and inline with the connecting rod 18 the crosshead will be in its maximumrearward position. In these respective posi- Ill) tions the angle A isconsiderably less than the angle B and accordingly movement of thecrosshcad from the position shown in Fig. 2 to that shown in Fig. 3 willtake place during rotation of the crank through an angle less than 180degrees which is determined by the difference between angles A and B.Thus forward movement of the crosshead takes place during movement of Ithe crank through an angle of 180 degrees plus the above difference.Accordingly, uniform crank shaft rotation causes the crosshead to moverearwardly faster than forwardly. The result is that the crank shaftrotation can be brought up to such a speed as to impart a normal rate offorward movement of the die for forging operations. Thus a greaternumber of strokes will be made by the crosshead in a given length oftime. Accordingly, bits may be quickly forged before the heat therein indissipated resulting in a greater quantity of better forged bits. Byhaving the crank center disposed below the line of movement of the wristpin 17 the crank pin 14 will, when in a vertical position, about thetime the die engages the bit, be more nearly in a plane containing thepath of movement of the crosshead than if the crank center were in saidplane, and accordingly exerts an actuating force in more of a directline to the crosshead at the time most needed. Due to .the quick returnthe roller die is more apt to be given a quick spinning action due todragging engagement with the bit and die 12 than if the die moves at thesame rate on both strokes, the advantages of which have been previouslydiscussed.

While I have in this application specifi cally described one form whichmy invention may assume in practice, it Will be unde stood that thisform of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

WVhat I claim as new and desire to secure by Letters Patent is:

1. A cutter bit forging machine comprising a roller forging die andcutter bit sup porting means, and means for causing rela tivereciprocatory rectilinear movement thercbetween including a crank shaftand connecting rod adapted when in alinement to be disposed at an angleto the path of relative movement.

2. A cutter bit forging machine comprising die means, a cutter bitsupport, and means for causing relative reciprocatory rectilinearmovement therebetween including a crank and connecting rod adapted tocause normal forging movement and a higher rate of return movement.

3. A cutter bit forging machine comprising a rectilinearly reciprocablecrosshead carrying at its respective ends a roller forging die and aconnecting rod, a crank shaft connected to said rod and having its axisof rotation offset from the line of movement of the rod connection tothe crosshead.

l. A cutter bit forging machine comprising a crosshead carrying forgingdie means movable in a straight line, and a crank and connecting rod foractuating the same disposed to the rear thereof, said crank being sodisposed as to impart at the moment of forging an actuating force tosaid crosshead in substantial alinenient with the path of movementthereof.

In testimony whereof I affix my signature.

HALBERT B. HALVORSEN.

Certificate of Correction. Patent No. 1,633,742. Granted June 28, 1927,to

HALBERT B. HALVORSEN.

It is hereby certified that error appears in the printed specificationof the abovenumbered patent requiring correction as follows: Page 1,line 15, for the Word must read most; page 2, line 21, for the Word inread is, and that the said Letters Patent should be read With thesecorrections therein that the same may conform to the record of the casein the Patent Oflice.

Signed and sealed this 18th day of October, A. D. 1927.

[SEAL] M. J. MOORE,

Acting Commissioner of Patents.

